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Significant Customers/Vendors (Details) | 3 Months Ended | 12 Months Ended
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Mar. 31, 2022 | Dec. 31, 2021
Significant Customersvendors [Abstract] |  |
Accounts receivable percentage | 62.50% | 41.10%
Revenue percentage | 70.00% | 40.00%
Outstanding accounts payable percentage | 57.90% | 69.10%

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- Definition The percentage of receivables method is used to derive the bad debt percentage that a business expects to experience. The technique is used to populate the allowance for doubtful accounts, which is a contra account that offsets the accounts receivable asset. + References No definition available. + Details
Name: | crex_AccountsReceivablePercentage
Namespace Prefix: | crex_
Data Type: | dtr:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Accounts payable (AP) is the amount owed for the purchase of goods or services at a specific date. Accounts payable is recorded at the time an invoice is approved for payment and recorded in the General Ledger (or AP sub-ledger) as an outstanding, or open, liability because it has not been paid. + References No definition available. + Details
Name: | crex_OutstandingAccountsPayablePercentage
Namespace Prefix: | crex_
Data Type: | dtr:percentItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | crex_SignificantCustomersvendorsAbstract
Namespace Prefix: | crex_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of remaining performance obligation to total remaining performance obligation not recognized as revenue. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b)(1) -URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130556-203045 + Details
Name: | us-gaap_RevenueRemainingPerformanceObligationPercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant